Cool Cat Kakuro (カックロ): The math version of a crossword puzzle

Kakuro (Japanese: カックロ) is a kind of logic puzzle that is likened to a mathematic transliteration of a crossword puzzle. The classic Kakuro puzzle is played in a grid of crowword-like cells white and black barred, "black" and "white" respectively. Puzzles are usually 16×16 in size. Apart from the top row and leftmost column which are entirely black, the grid is divided into "entries"-lines of white cells-by the black cells. The black cells contain a diagonal line from upper-left to lower-right and a number in one or both halves, such that each horizontal entry has a number in the black half-cell to its immediate left and each vertical entry has a number in the black half-cell immediately above it. These numbers are "clues". Fun gift for the commuter, math fan, puzzle lover, sudoku fan. Much harder and more rewarding to solve than sudoku. For all ages.